Petebs vi



(No Model.)

H. OONDRON.

PLANE BIT.

No. 426,686. Patented Apr. 29, 1890.

UNITED STATES PATENT OFFICE.

HENRY CONDRON, OF CHICAGO, ILLINOIS, ASSIGNOR OF ONE-HALF TO IVILLIAM II. BARRY, OF SAME PLACE.

PLAN E-BIT.

EEPECIFICATION forming part of Letters Patent No. 426,636, dated April 29, 1890.

Application filed February 1890. Serial No. 339,795. (No model.)

0 11/71/0711, I may Q The chisel, back plate, and clamp-plate are Be it known that LIIENRY CONDRON, of attached to each other by means of the usual Chicago, in the county of Cook and State of clamp-screw (Z. It will be seen that a press- Illinois, have invented certain new and useful ure upon the point a of the chisel tends to 5 Improvements in Plane-Bits, of which the folbend said chisel back over the edge I) of the lowing is a full, clear, and exact description, back plate, which forms a fulcrum therefor. reference being had to the accompanying To overcome this tendency,I interposea sup- 5o drawings, forming a part of this specification, plemental clamp-plate 6 between the chisel a in which and clamp-plate c, which supplemental plate to Figure 1 isva perspective view of a planeis bent at c, and the edge of which bears upon bit embodying the features of my invention. the chisel-plate above the edge I) of the back Fig. 2 is afront view of the same,,and Fig. is plate I) and at the point of greatest vibration a central longitudinal sectional View thereof. in said chisel-plate. It is obvious that upon Like letters. of reference in the different clamping the respective plates together, as I 5 figures indicate like parts. shown, by means of the clamp-screw, the My invention relates to that class of planepressure upon the chisel-plate a is as great bits in which the chisel or cutting portion is above as below the lower end of the back made from a thin plate of steel supported plate. I have found in actual practice that by a back plate of inferior metal. This all vibration of the chisel is thereby obviated.

2o coi'istruetion, while possessing many advan- IIflVlIlglJllLlStlQSCllbOCl my invention, what I tages, is subject to the objection that a 0011- claim, and desire to secure by Letters Patent, siderable vibration thereof is produced in is-- planing hard woods, which makes it impos- 1. The combination, in a plane-bit, of a sible to produce satisfactory work with it. chisel consisting of a thin plate of steel, a

2 5 The object of my invention is to overcome back plate, a clamp-plate having its edge lbethis objection by providing a supplemental low the edge of the back plate, and an interclamp-plate, by which the thin chisel-plate is posed supplemental clamp-plate having its supported at the point of greatest strain, bearing edge upon the plane-chisel above the while the usual clamp-plate is retained to lower edge of the back plate, substantially as 0 regulate the bite of the chisel; all of which shown and described.

is hereinafter more particularly described, 2. The combination, in a plane-bit, of the and definitely pointed out in the claims. chisel a, back plate I), clan1p-plate c, supple- Referring to the drawings, a represents the mental clamp-plate e, and a clamp-screw for plane-chisel, which consists of a thin plate of holding the same in the respective positions 35 steel, having the usual chiseledge a, Fig. 3. with relation to each other, substantially as b is the back plate, and c the usual front shown and described. or clamping plate bent, as shown at c, and In testimony whereof I have signed this having the usual thin tapered edge 0 as specification, in the presence of two subscribshown, which isintended to be adjusted near ing witnesses, this 6th day of February, 1890.

40 to the chisel-edge a, according to the work to HENRY CONDRON.

be done, said tapered edge of the clamping \Vitnesses: plate being preferably below the end b of D. II. FLETCHER, the back plate I). .I. 13. IIALPENNY. 

